Fe-Mn-Al-Ni based shape memory alloys exhibit an extremely low temperature dependence of the critical stress for martensitic transformation and display an ultra-wide superelastic temperature range (from -263 ℃ to 240 ℃). Therefore, these shape memory alloys show promising applications in aerospace, space exploration, vibration and seismic damping, and other environments with variable working conditions. In this work, the main factors affecting the superelasticity of Fe-Mn-Al-Ni based shape memory alloys are reviewed and prospected. Since the precipitation of the coherent B2 nano-phase plays a key role in the martensitic transformation from non-thermoelastic to thermoelastic in Fe-Mn-Al-Ni-based shape memory alloys. The mechanism by which the coherent B2 nano-phase modulates the martensitic transformation of Fe-Mn-Al-Ni-based shape memory alloys and the related progress of its size regulation are firstly discussed. Since the superelasticity of Fe-Mn-Al-Ni-based shape memory alloys is known to be positively correlated with the grain size, the preparation of single crystals is a prerequisite for achieving excellent superelasticity. Therefore, the single-crystal growth studies of Fe-Mn-Al-Ni-based shape memory alloys in recent years are reviewed. Then, the functional properties of single-crystal Fe-Mn-Al-Ni-based shape memory alloys are summarized. Finally, the further research and development of the Fe-Mn-Al-Ni based shape memory alloys, such as the regulation mechanism of the coherent B2 nano-phase for martensitic transformation, the further development of large-size single crystals, and the improvement of the natural aging and cyclic superelasticity stability, are prospected.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |